Correcting process for post welding distortion of friction stir welding

A technology of friction stirring and process technology, which is applied in the field of aluminum alloy welding, can solve the problems such as limited adjustment and repair range of butt welded blanks, failure to meet production requirements, deformation, etc., to eliminate welding residual stress, good adjustment and repair effect, and reduce warping The effect of corner deformation

Inactive Publication Date: 2019-07-16
辽宁忠旺铝合金精深加工有限公司
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Problems solved by technology

[0003] In view of this, in order to solve the problem in the prior art that even if mechanical repairing, flame repairing or a combination of the two methods are adopted, the re

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  • Correcting process for post welding distortion of friction stir welding
  • Correcting process for post welding distortion of friction stir welding
  • Correcting process for post welding distortion of friction stir welding

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[0036] Example

[0037] In this embodiment, the splicing and welding of the bottom plate of the battery tray of a new energy vehicle is taken as an example. The bottom plate is formed by splicing 7 pieces of 6063-T6 aluminum alloy profiles. The total length is about 2.4m, the width is 1.7m, double-sided welding, and a total of 6 pieces on one side. Welding bead, the length of a single bead is ≥1.6m, a total of 19.2m bead, the welding volume is very large, so the post-weld deformation is large, and the single-sided warpage angle deformation is as low as 25mm. After welding, it has been mechanically adjusted and flame adjusted The combined method of warping angle deformation is still visible to the naked eye. At the same time, blue traces appeared on the surface of the product adjusted by the oxyacetylene flame, which had a negative impact on the surface quality.

[0038] Friction stir welding is a kind of pressure welding, which uses the pressure of the stirring head to the product...

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Abstract

The invention belongs to the technical field of aluminum alloy welding and relates to a correcting process for the post welding distortion of friction stir welding. For a raised surface of a weld seamof an aluminum alloy profile to be welded, a stir-welding head without a stirring pin is used to perform "similar friction stir welding" on the weld seam; according to the raising degree of a bulge near each weld bead, the parameters, a revolution speed at 700-1,200 r/min and a feed speed at 1,300-1,800 mm/min, are adopted for re-stirring on the weld bead, so as to apply the effects of force andheat onto the product evenly; according to the distortion formed in the previous friction stir welding, a "reverse distortion" is applied in the same way to achieve a correcting effect, so as to allowthe amount of the distortion formed in the friction stir welding to be less than 3 mm and reduce the angular warping distortion of the weld seam; and the welded profile meets the requirement of product weld seam flatness.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy welding, and relates to a process for adjusting and repairing deformation after friction stir welding. Background technique [0002] There are generally two traditional repair methods for post-weld deformation: one is mechanical repair, and the other is flame repair. However, the traditional repairing process has its own defects: mechanical repairing uses hammering and pressing methods to apply anti-deformation to the product. This method takes a long time to repair, and if it is not handled properly, it will easily cause mechanical damage to the product and it is difficult to repair; The flame adjustment uses the principle of thermal expansion and contraction to heat the back of the weld, so that the product will rebound in the opposite direction of deformation, but the surface quality of the aluminum alloy material that has been heated for a long time will deteriorate, and the heated part...

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Application Information

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IPC IPC(8): B23K20/12B23K20/24B23K20/26
CPCB23K20/122B23K20/1245B23K20/24B23K20/26
Inventor 于欣田峰谷晗沈其明郝玉喜秦瑶贾永强吴彦霖
Owner 辽宁忠旺铝合金精深加工有限公司
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